Demountable device in a loom for weaving



Dec. 26, 1961 PFARRWALLER DEMOUNTABLE DEVICE IN A LOOM FOR WEAVING Filed Oct. 6, 1 958 Fig. 1

3 Sheets-Sheet 1 [VFW/Al FFA RR WAUFR IN V EN TOR.

ATTOF/Vf) Dec. 26, 1961 E. PFARRWALLER 3,014,504

DEMOUNTABLE DEVICE IN A LOOM FOR WEAVING Filed Oct. 6, 1958 3 Sheets-Sheet 2 41 Fig. 18 92 INVENTOR. [KW/Al PfiWRW/ill [7? BY ATTOR/V y Dec. 26, 1961 E. PFARRWALLER 3,014,504

I DEMOUNTABLE DEVICE IN A LOOM F OR WEAVING Filed Oct. e, 1958 5 Sheets-Sheet :5

INVENTOR. 5/? WM! PFAKRWALL [1? A TTORNEV United States Patent Gilles 3,014,504 Patented Dec. 26, 1961 The present invention relates to an apparatus for moving a device or mechanism forming part of a loom for weaving into a position in which it can easily be removed for repair or interchange.

An object of. the invention is to provide an apparatus for moving a device or mechanism forming part of a loom for weaving into a position in which it can be removed for repair or interchange without demounting parts for driving or supporting the device or other parts so that no new readjustment of the device or its drive is required and excessively long unproductive interruption of the operation of the loom is avoided and no specially trained mechanics are needed for carrying out the interchange of a faulty or worn device with a perfect-device. The apparatus according to the invention comprises a movable carrier for the device whose removability and interchangeability is desired and guide means opera- I tively associated withthe device for actuating the device upon movement of the carrier whereby the position of the device is defined by the carrier and the guide means when the apparatus is in the operative position. The relative position of the carrier and of the guide means is changeable so that space can be provided permitting removal of the device from its carrier without removing or disconnecting other parts of the loom.

The novel features which are considered characteristic of the invention are set forth with particularity in the appended claims. The invention itself, however, and additional objects and advantages thereof will best be understood from the following description of embodiments thereof when read in connection with the accompanying drawing in which:

FIG. 1 is a diagrammatic illustration of a loom for weaving. as seen from the cloth beam side, parts being broken away to make other parts visible.

FIG. 2 is a part sectional side'elevation of scissors for cutting weft threads and of a mechanism of actuating the scissors.

FIG. 3 is a part sectional top view of the device shown in FIG. 2.

FIG. 4 shows a portion of the mechanism shown in 7 FIG. 2 in a rest position.

FIG. 5 shows guide means forming part of the mech anism shown in FIGS. 2 to 4. a

FIG. 6 is a part sectional view of the scissors forming part of the apparatus shown in FIGS. 2 to 5 and of adjacent parts in a larger scale and at a right angle to the illustration of FIG. 2, the section being made along line VI-VI in FIG. 2.

FIGS. 7' and 8 are top views of the carrier and the scissors supported thereby and forming part of the apparatus shown in FIGS. 2 to 6 in two different operating positions.

FIG. 9 is a large scale side elevation of the carrier forming part of the apparatus shown in FIG. 2.

FIGS. 10 and 11 are cross sectional views of the carrier shown in FIG. 9 and of the guide for the carrier in two different elevations, the section shown in FIG. 10 i being made along line XX and the section shown in FIG. 11 being made along line XI-XI in FIG. 9.

FIG. 12 is an elevation of a modified carrier and guide therefor.

means for the device to be actuated is adjustable.

FIG. 18 is a top view of a portion of the apparatus shown in FIG. 17.

' Like parts are designated by'like numerals in several figures of the drawing.

Referring more particularly to FIG. 1 of the drawing, a motor 11 which is mounted on a right side shield 12 of the frame of a loom for weaving drives a pulley 14 by means of V-belts 13. The pulley 14 forms one part of a clutch accommodated within the pulley and not visible. The other part of the clutch is connected to the main shaft 15 of the loom. Shaft 15 drives several mechanisms forming part of the loom either continuously or intermittently when the loom is in normal weaving operation. The shaft 15 actuates a warp beam 16'and controls a warp 17, the warp threads extending through heddles mounted on heddle frames 18. The shaft 15, by means of a chain 40, also drives a shaft 39 forming part of an eccentric drive for moving the heddle frames 18 up and down, for opening, closing and changing the shed. The shaft 15 also drives a control beam 19 and a cloth cam 2 for winding the cloth 21.

The shaft 15 actuates at the proper moments, through suitable intermediate gears, shuttle picking and receiving mechanisms contained in casings 22 and 23. The shaft 15 also actuates a lay 28 including a reed 29.

The weft thread 24 is presented to a shuttle 25 waiting in the casing 22 of the shuttle picking mechanism. The thread 24 is pulled from a spool 27 supported by a carrier 26 and being separate from the shuttle 25. The shuttle is picked through guide teeth 25a across the shed and received by the shuttle receiving mechanism in the casing 23. Thereupon the weft thread 24 is beaten up by the lay 28.

The weft thread 24 is now released from the shuttle 25 by means forming part of the shuttle receiving device, whereupon the idle shuttle is returned below the shed by means of a return mechanism in a housing 30, which return mechanism is driven by the main shaft 15, from the shuttle receiving mechanism to the shuttle picking mechanism.

A left side shield 12a is connected to the side shield 12 by means of a box girder 31 to form a rigid frame for the loom. The drive and control 32 of the control beam 19 are mounted on the left side shield 12a.

Handles 33 connected to a control rod 34 serve for actuating the clutch in the pulley 14 through suitable linkage means 35 and for actuating a brake located in a brake housing 37 by means-of a linkage 36 for starting and stopping the loom from various localities around the loom. The brake in the housing 37 acts on the -main shaft 15 and is applied at improper operating con- 7 to an initial or zero position of the main shaft.

Referring more particularly to FIGS. 2 and 3 of the drawing, two cams 42 and 43 are mounted on a shaft 41 forming part of the shuttle picking mechanism in the casing 22. The shaft 41- is driven by and at the same speed as the main loom shaft 15 by means, not shown. The cams 42 and 43 engage follower rollers on a lever 44 which rocks on a shaft 45 and whose upper arm is connected to a link 46 by means of a disconnectable pivot conhection 47. The free end of the link 46 is pivoted to a member 48 which is clamped to a shaft 49 which is accommodated in the casing 22. A tooth segment 50 whose teeth mesh with the teeth of a rack rod 51 is mounted to one end of the shaft 49. The rod 51 reciprocably moves up and down in suitable recesses 53 cut into the walls ofv the casing 22 and closed by a plate 52 (FIG. 3). An arm 54 is connected to the lower end of the rack rod 51, a pin 55 being connected with the arm 54 to Which scissors 56 are attached.

The rod 51 with the arm 54 form a reciprocably moving carrier for the scissors 56 which are moved from a lower rest position A into an upper operating position B and back to position A during each picking cycle of the loom. When the scissors '56 are in the operating position B they sever the weft thread 24, which lays in the shed, from the weft thread supply spool 27. The end of the thread extending from the supply spool is presented in known manner to the subsequently picked shuttle. FIG. 2 shows the scissors 56 in the operating position B. The blades of the scissors are closed whereas they are open when the scissors are in the rest position A (FIG. 4). The control of the scissors is effected by guide grooves 58 in a suitable guide plate 60 which is mounted on the housing 30 of the shuttle return mechanism.

The lower ends of the blades 57 of the scissors 56 are provided with rollers 61 adapted to roll in the grooves 58. As seen in FIG. the lower portions of the grooves 58 are farther apart than the'upper portions so that the rollers 61 are moved apart when the scissors move to the rest position A whereby the blades 57 of the scissors are spread apart. The upper portions of the grooves 58 are closer together, closing the scissors when the rollers 61 move towards the operating position of the scissors.

As seen in FIG. 6 the pin 55 is riveted to the arm 54. A bushing 62 is pushed onto the pin 55 for supporting the scissor blades 57 which are arranged between two axially resilient washers 63. The right washer 63 rests against a shoulder 64 on the bushing 62. The left washer 63 is held on the bushing 62 by suitably swaging of the left en of the bushing. Y

The scissors 56 are held in position by the carrier, more particularly by the part 54 and the guide plate 60. In order to remove or interchange the scissors the carrier 51, 54 can be oscillated about the longitudinal axis of the rod 51 as will be described later. The arm 54 is provided with an abutment 65 which abuts against the rear surface of the guide plate 60 when the device is in operating position, the scissors 56 being movable on the front side of the plate 60.

FIG. 7 shows the carrier 51, 54 in the operative position of the apparatus in which the rollers 61 mounted on the scissor blades 57 move in the grooves '58 (FIGS. 2 to 6) and the abutment 65 abuts against the plate 60. In order to move the carrier 51, 54 into the position shown in FIG. 8 the arm 54 and the rod 51 must be lifted until the arm 54 is in the position indicated by dash-dot lines C in FIG. 2 whereby the abutment 65 is opposite a recess 66 in the plate 60 (FIGS. 2, 4, 5). In this position the rod 51 with its arm 54 can be swung clockwise because the lateral surfaces 67 of the rod 51 are provided with slanted portions 68 which are spaced from the guiding surfaces of the guide recess or channel 53 when the apparatus is in the operative position. If the rod 51 with the arm 54 is swung clockwise as far as permitted by the aforedescribed structure, there is enough space between the end of the arm 54 and the plate 60 to pull the scissors 4 56 from the pin 55 and place new scissors on the pin. In order to reduce the extent of the movement of the carrier for opening and closing the scissors and for removing the latter, the guide plate 60 may also be made movable.

In the modification shown in FIG. 9 the abutment 65 is omitted and the upper end 70a of the rack rod 70 has a rectangular cross section which completely fills the guide recess 53 (FIG. 10). The sides 72 of the portion 70b of the rod 70 which portion is below the portion 70a are slanted (73) in a similar manner as the sides of the rod 51 shown in FIG. 7. When the upper end portion 70a of the rod 70 is in the guide recess 53 which is cut into the wall of the casing 22 and covered by the plate 52 the rod 70 cannot oscillate on its longitudinal axis and the scissors 57 cannot be removed from the guide plate 60. This is only possible when the rod 70 is moved so far upward that the portion 70a is outside of the recess 53.

Instead of providing an upper end portion of the rod 76; of rectangular cross section and in order to reduce the width of the rod 70 a flap 74 may be mounted to the upper end of the rod 70' which flap moves in a suitable recess 75 provided in the cover plate '52. This modification is shown in FIGS. 12 and 13. When the scissors are in operating position the flap 74 is in the position B in FIG. 12. When the scissors are in rest position the flap 74 is in the position A in FIG. 12. If it is desired to remove the scissors from the arm 54 the rod 7 0 must be so far lifted that the flap 7 4 is in the position C, i.e., above the recess 75 so that the rod 70 can be oscillated on its longitudinal axis.

In the modification shown in FIG. 14 the rod 76 which corresponds to the rod of the mechanism shown in FIG. 2 and to the rod 76 of the embodiment of the invention shown in FIG. 9 and on which the rack engaging the tooth segment 50 shown in FIG. 2 and not shown in FIG. 9 is provided, has a semicircular cross section fitting in a recess 71, having a corresponding semicircular cross section, in the wall of the casing 22 and needs only one slanted surface 77 for providing the necessary space between the rod and the cover plate 52'. A flap 78 corresponding to the flap 74 in FIGS. 12 and 13 is riveted to the upper end of the rod 76 for guiding the rod when it is in the operative position. Instead of the fiap 78 an abutment, Ias 65 in FIGS. 3, 7 and 8, may be connected to the arm '54 which is connected to the lower end of the rod 76.

The pivot connection 47 between the upper arm of the actuating lever 44 and the link 46 is made disconnectable in order to be able to lift the carrier rod 51, 7t), 70 Or 76 so that the carrier can be lifted into the position C in which the scissors can be disconnected. l he disconnectable pivot means are illustrated in FIGo. 15 and 16. A pin 79 is made fast on the upper end of the lever 44. A bushing 80 is axially movable on the pin 79 against the action of a spring 81, the bushing having an end 82 extending into a bore 83 in the link 46, the bore 83 having a lateral opening 84 permitting passage of the pin 79 upon retraction of the bushing from the link 46. The link 46 can, therefore, be lifted from the pin 79 and from the lever 44, independently of the position of the latter, and the link 46 can be pulled so far to the left in FIG. 2 that the toothed segment 50 is turned so far beyond the operating position of the apparatus that the upper end of the rod 51, 70, 70' or 76 projects above the guide 53 or 71 and the arm 54 is in the position C in which it can be turned outward for removing or replacing the scissors 56. After removal of the scissors the carrier consisting of the rod 51, 70, 70' or 76 and the arm 54 can be turned back into the positions shown in FIGS. 3, 7, 13 and 14 whereby the link 46 is pulled to the right and its recess 83, 84 can receive the pin 79 as well as the bushing 80 for holding the pin in the bore part 83 of the recess. The apparatus is now again in the operative position.

The disconnectable joint 47 facilitates removal of the scissors 56 without demounting and possibly readjusting of the parts between which the scissors are interposed.

in the embodiment of the invention shown in FIGS. 17'

and 18 the shaft 41 which is located in the casing 22 and driven by the main shaft of the loom, by means not shown, carries a cam 85 which actuates a lever 36 pivoted on a pin 87. The lever is pressed against the cam 85 by means of a spring 88, the right end of the lever being provided with a pin 96 carrying scissors 89. In order to move the scissors into a position in which they can be separated from the lever 86 a guide plate 96 is provided whose position relative to a stationary part of the loom can be changed. For this purpose the guide plate is provided with a slot 91 through which extends a bolt 92 for making the guide plate fast on a stationary part 99 of the loom. The plate 90 has grooves 94 for guiding protuberances 95 which may be formed by pins or rollers and mounted on the blades of the scissors for controlling the operation of the scissors. The lower ends 93 of the guide grooves 94 are open so that the rollers or protuberances 95 move outside of the guide grooves when the plate 90 is moved upward. In this position the scissors can be pulled out of the pin 96.

The guide plate 90 has lateral rim portions 97 extending into corresponding grooves 98 in the stationary part 99 of the loom which may be an arm mounted on a casing 106 which may be located at a locality of the loom where the fabric produced by the loom must be cut longitudinally of the fabric by the scissors 89 cutting the weft threads 24. Since the guide plate 90 can be moved the carrier 86 for the escissors 89 need not be moved into a position outside of its normal operating positions for removing the scissors and no readjustment of the drive means for the scissors is required when the latter must be replaced.

What is claimed is:

1. 'In a loom for weaving, an apparatus including a movable carrier, a device mounted on said carrier and movable with said carrier between a rest position and an operating position, said device including at least one movable member, guide means operatively associated with said movable member and controlling the movement of said member upon movement of said carrier, the position of said device being determined by' said carrier and said guide means when said apparatus is in its operative position, the relative position of said carrier and of said guide means being changeable for placing said apparatus into an inoperative position in which said device can be removed from said carrier.

2. In a loom for weaving as defined in claim 1 and in which said carrier is movable between a first position in which said device is in the rest position and a second position in which said device is in the operating position and into a third position affording changing the relative position of said carrier and of said guide means for permitting removal of said device from said carrier.

3. In a loom for weaving as defined in claim 1 and in which said carrier includes a rod, a guide channel being provided for longitudinally movably guiding said rod, the latter having a lateral surface portion spaced from the inside of said guide channel when said apparatus is in its operative position and permitting oscillating movement of said rod on the longitudinal axis of said rod to a position where said lateral surface portion abuts against the inside of said guide channel and said device is away from said guide means, aliording removal of said device from said carrier.

4. In a loom for weaving as defined in claim 1 and including drive means for said carrier, said drive means including at least two relatively movable elements, disconnecting means being interposed between said elements for disconnecting said elements and rendering said drive means ineffective.

5. In a loom for weaving according to claim 4 and wherein said disconnecting means include a bushing extending into a bore in one of said elements, a pivot pin extending through said bushing into and being connected with the second element, and a spring interposed between said pin and said bushing for urging the latter into said rst element and permitting retraction of said bushing out of said bore against the action of said spring, said bore having a lateral opening permitting passage of said pin and removal of said first element from said pin upon retraction of said bushing.

6. In a loom for weaving, an apparatus including a movable carrier, a device mounted on said carrier and movable with said carrier between a rest position and an operating position, said device including at least one movable member, guide mean operatively associated with said movable member and controlling the movement of said member upon movement of said carrier, said guide means including a guide groove, a protuberance extending from said member and being slidable in said groove, the latter having an open end through which said pro tuberance can be moved outside of said guide means for removing said device from said guide means, said guide means including an element mounted adjustably as to its position on a stationary part of the loom, said guide groove being provided in said element.

7. In a loom f0r weaving as defined in claim 1 and wherein said carrier includes a rod, a guide channel being provided for longitudinally movably guiding said rod, the latter having at least a portion which is oscillatory in said guide channel, an abutment being connected to said rod, said abutment abutting against said guide means when said apparatus is in the operative position, and a recess being provided in said guide means, said recess being adapted to receive said abutment for permitting rocking of said rod on its longitudinal axis for moving said carrier away from said guide means to permitremoval of said device from said carrier.

References Cited in the file of this patent UNITED STATES PATENTS 1,265,590 Beaverstock May 7, 1918 1,427,423 Stimpson Aug. 29, 1922 1,805,046 Menschner May 12, 1931 FOREIGN PATENTS 60,085 Switzerland June 15, 1912 

